Hi Ashraf,
Without a service and a path, an AI is only a consist! You can make as many consists as you like using AE, ConBuilder, Route-Riter or Convoi, if that's all you want to do. To link those consists to a specific journey and time, you must create suitable paths and services using Activity Editor. You CAN, of course, use a "dummy" activity (one which will be discarded) to build your paths and services, but you would still need to incorporate them into a "proper" activity to be able to use them. I stand to be corrected, but that's the only way I know
Cheers,
Ged
EDIT : Thanks Baldwin - I've left my post as I wrote it because I'm not sure what Ashraf is hoping to do!!